Merge branch 'tracing' of git://repo.or.cz/qemu/stefanha

* 'tracing' of git://repo.or.cz/qemu/stefanha:
  trace: add arguments to bdrv_co_io_em() trace event
  trace: trace monitor qmp dispatch/completion
  trace: trace bdrv_open_common()
  hmp: re-enable trace-file command

diff --cc hmp-commands.hx
Simple merge

diff --cc monitor.c
Simple merge